CY7C68300C-100AXC

Controllers Overview

The CY7C68300C-100AXC is a fixed-function USB 2.0 to ATA/ATAPI bridge controller from the EZ-USB AT2LP series, manufactured by Cypress Semiconductor Corp. It provides a hardware-based interface between a USB host and one or two ATA/ATAPI mass storage devices without requiring firmware programming. The device supports USB High Speed (480 Mbps) and Full Speed (12 Mbps) signaling, compliant with the Mass Storage Class Bulk-Only Transport specification. It features a 4 KB FIFO buffer to optimize data transfer rates and supports ATA PIO Modes 0, 3, and 4, Multiword DMA Mode 2, and UDMA Modes 2, 3, and 4. The component operates on a single 3.3V power supply and includes an internal I2C bus master for configuration via external serial EEPROM.

Controllers Feature Summary

• Fixed-function architecture eliminates the need for custom firmware development.
• Supports dual power modes for flexible self-powered and bus-powered designs.
• Includes a 4 KB FIFO buffer to minimize data loss during ATA seek operations.
• Provides backward pin compatibility with the legacy EZ-USB AT2 (CY7C68300A).

Controllers Applications

• Bus-powered Compact Flash readers
• Portable USB hard drive enclosures
• CD-ROM and DVD-RAM drives
• MP3 and personal media players

Controllers Procurement Notes

Verify the specific package type against the ordering suffix, as the datasheet defines the CY7C68300C family primarily in 56-pin SSOP and QFN packages. Confirm that the required design utilizes the backward compatibility mode if migrating from older CY7C68300A platforms, which requires specific EEPROM signature programming. Ensure the external crystal matches the 24 MHz requirement for proper clock derivation.

Controllers Selection Notes

Select this component when a cost-effective, firmware-free solution for ATA/ATAPI bridging is required. It is suitable for designs needing support for large hard drives via 48-bit addressing and ATA security features. Consider the CY7C68320C/321C variants if GPIO functionality or HID button controls are necessary, as these are not available in the CY7C68300C series.

Controllers Part Context

The CY7C68300C is part of the EZ-USB AT2LP family, serving as a successor to the ISD-300A1 and original EZ-USB AT2. It is designed to reduce cost and power consumption in mass storage applications. The C-series offers Pb-free packaging options and maintains electrical compatibility with previous generations while adding support for modern USB 2.0 high-speed standards.

Controllers Replacement Considerations

Public confirmed substitute part numbers: CY7C68300B-56PVXC.